ArrayIndexOutOfBoundsException in AbstractBroadcasterCache

[dhoffer]

This was observed in 1.0.1.

Recently I got the following error in AbstractBroadcasterCache.

22 Oct 2012 13:19:07,910 WARN  DefaultBroadcaster []: Unable to track
messages ipt.tas.chatdashboard.ui.gwt.client.comet.CometPayload@745375c0
java.lang.ArrayIndexOutOfBoundsException: 541
        at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:368)
        at java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:377)
        at org.atmosphere.cache.AbstractBroadcasterCache.addToCache(AbstractBroadcasterCache.java:135)
        at org.atmosphere.cpr.DefaultBroadcaster.trackBroadcastMessage(DefaultBroadcaster.java:845)
        at org.atmosphere.cpr.DefaultBroadcaster.push(DefaultBroadcaster.java:618)
        at org.atmosphere.cpr.DefaultBroadcaster.push(DefaultBroadcaster.java:556)
        at org.atmosphere.cpr.DefaultBroadcaster$2.run(DefaultBroadcaster.java:527)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)

Not sure what actually caused this but I notice in code that queue is not fully synchronized (start method) so that could cause this, perhaps something else too? Perhaps in derived classes since queue is protected??